期刊
PHYSICAL REVIEW A
卷 82, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.82.022317
关键词
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资金
- Preparatory Research Foundation of the National University of Defense Technology [JC08-02-01]
- National Natural Science Foundation of China [10904174]
We present a discretely modulated continuous-variable quantum key distribution system in free space by using strong coherent states. The amplitude noise in the laser source is suppressed to the shot-noise limit by using a mode cleaner combined with a frequency shift technique. Also, it is proven that the phase noise in the source has no impact on the final secret key rate. In order to increase the encoding rate, we use broadband homodyne detectors and the no-switching protocol. In a realistic model, we establish a secret key rate of 46.8 kbits/s against collective attacks at an encoding rate of 10MHz for a 90% channel loss when the modulation variance is optimal.
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